ERROR_DS_ATT_NOT_DEF_FOR_CLASS - 8317 (0x207D)
An attempt was made to modify an object to include an attribute that is not legal for its class.
Updated: Feb 21, 2026
Technical Meaning
The error code ERROR_DS_ATT_NOT_DEF_FOR_CLASS with the numeric value 8317 and hexadecimal representation 0x207D indicates that an attempt was made to modify an object by adding or changing attributes, but these attributes are not defined for the class of the object being modified. This error typically arises in directory service operations where attribute validation is critical.
Error Details
This error suggests that during a modification operation on an object within a directory service (such as Active Directory), one or more attributes were specified that do not conform to the schema defined for the class of the target object. The schema defines which attributes are valid and mandatory for each object class, and attempting to add or modify attributes outside this definition results in this error.
Usage Context
This error is commonly encountered in scenarios where directory service operations such as adding, modifying, or deleting objects require adherence to a predefined schema. It can occur when using APIs like the Windows Directory Services API (DSAPI) or LDAP operations that involve attribute manipulation.
Developer Interpretation
Developers should ensure that any attributes being added or modified during object operations are consistent with the schema definition for the target object class. This includes validating input parameters and ensuring that only valid attributes are specified in operation requests. Failure to do so can result in this error, leading to unsuccessful modifications and potential data integrity issues.
Related Errors
ERROR_DS_ATT_ALREADY_EXISTS(8319): An attribute already exists for the object.ERROR_DS_ATT_NOT_DEF_IN_SCHEMA(8402): The specified attribute is not defined in the schema.ERROR_DS_CANT_MOD_DSA_PROP(8356): Cannot modify a property of the directory server itself.
FAQ
Q: What does this error mean?
A: This error indicates that an attempt was made to add or modify attributes for an object, but these attributes are not defined for the class of the target object.
Q: How can I resolve this issue?
A: Ensure that all attributes being modified are valid according to the schema definition for the target object class. Validate input parameters and adhere strictly to the schema constraints.
Summary
The ERROR_DS_ATT_NOT_DEF_FOR_CLASS error is a specific technical indicator in directory service operations where attribute validation fails due to non-compliance with the defined schema. Developers must ensure that all attributes used in such operations are correctly specified according to the object class definitions to avoid this error and maintain data integrity.